TajMan Posted October 17, 2007 Share Posted October 17, 2007 Long story but in a nutshell: '87 truck, Head rebuilt, bottom end MAY not last but giving a try, finally got spark and got it started. Feels like its running on 5 cylinders. Did compression check: 125, 115, 120, 120, 120, 120 #1 spark plug looked like it might not have been igniting. So it has compression, ALL ignition components are new, what can cause 1 cylinder not to fire-fuel injector not opening? What should I test for with volt meter on fuel injector plug wires to see about this? Anyone have a spark plug wire routing diagram to be 100% certain? I'm 99%.. What can cause tapping noise from engine, continue tapping for awhile when engine is turned off!? Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 17, 2007 Share Posted October 17, 2007 The tapping noise after it shuts off is often the header contracting, you'll hear it when you start it up too. That's why they crack... Your's probably is, not that it's a huge issue. Injectors can get plugged. You can clean them. Link to comment Share on other sites More sharing options...
FxRacing282 Posted October 17, 2007 Share Posted October 17, 2007 its very possible its a bad spark plug. my quad had a bad new plug and my friends GS500 had new plugs and one was garbage i would try swapping the plugs or using a voltometer off your coilpack/distributer Link to comment Share on other sites More sharing options...
TajMan Posted October 17, 2007 Author Share Posted October 17, 2007 Replaced one spark plug that looked like wasn't firing, symptoms still the same. With engine running, pulled plug wires to see difference. Pulling cyl #1 wire made no difference, all others did as should. So #1 cylinder not igniting, but good plug & plug wire IS getting sent spark I got shocked by it. That cylinder had 125psi compression. This leads me to believe fuel injector not opening (I just swapped that wiring harness). So, attempting to test fuel injector wire voltage now. Does anyone have a pinout for main ECU connector wires & the #1 fuel injector, in case I have to jumper wire that? Link to comment Share on other sites More sharing options...
Pete M Posted October 17, 2007 Share Posted October 17, 2007 Off the top of my head I think the firing order is 1,5,3,6,2,4 Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 17, 2007 Share Posted October 17, 2007 Off the top of my head I think the firing order is 1,5,3,6,2,4 It says on the intake manifold. And I'd swap the inject with #2. See if the problem is on the #2 cylinder. If so, I'd probably get new injectors (yeah right) or soak them in injector cleaner, or more than likely I'd go to the boneyard and snag a couple more. Link to comment Share on other sites More sharing options...
mjeff87 Posted October 17, 2007 Share Posted October 17, 2007 Just remember it like this.... 15 is too young, 36 is too old, 24 is just right ;) Jeff Link to comment Share on other sites More sharing options...
TajMan Posted October 17, 2007 Author Share Posted October 17, 2007 And I'd swap the inject with #2. See if the problem is on the #2 cylinder. If so, I'd probably get new injectors (yeah right) or soak them in injector cleaner, or more than likely I'd go to the boneyard and snag a couple more. Thanks man! Swapped with #2, yep its a bad fuel injector. There was even some corrosion on the electrical connection of that injector. I'll grab one from the boneyard now. Just remember it like this.... 15 is too young, 36 is too old, 24 is just right ;) Jeff Awesome, thank you sir I have a horrible memory but I remembered that when I was in the garage. :D LETTING A CAR SIT FOR YEARS DOES MORE DAMAGE THAN YOU THINK! For this one: -bad fuel injector -bad coil -bad brakes -exhaust leak -lower compression in 1 cyl Not the first car I've revived after sitting for years either. Link to comment Share on other sites More sharing options...
jtdesigns Posted October 17, 2007 Share Posted October 17, 2007 LETTING A CAR SIT FOR YEARS DOES MORE DAMAGE THAN YOU THINK! For this one: -bad fuel injector -bad coil -bad brakes -exhaust leak -lower compression in 1 cyl Not the first car I've revived after sitting for years either. Not only that but with my s-10 Blazer thats been sitting for only 4 or 5 years has been eating by rats, squirrels, or worse MONKEYS!! I can't believe an animal would eat metal or fiberglass.. No one is safe anymore.. Link to comment Share on other sites More sharing options...
Eagle Posted October 17, 2007 Share Posted October 17, 2007 Anyone have a spark plug wire routing diagram to be 100% certain? I'm 99%.. 1-5-3-6-2-4 Link to comment Share on other sites More sharing options...
TajMan Posted October 18, 2007 Author Share Posted October 18, 2007 Junk yard fuel injector did it! Still plenty of things to address, but motor runs just ok now thanks guys. Link to comment Share on other sites More sharing options...
FxRacing282 Posted October 18, 2007 Share Posted October 18, 2007 no problemo Link to comment Share on other sites More sharing options...
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